Notebook computer speakers

The computer has one upper speaker (24) and a lower speaker (26). The upper speaker is mounted in the display housing (14) and the lower speaker mounted in the keyboard housing (16). They are mounted with foam seals to acoustically isolate out of phase sound waves from the front and back of the speakers defining a 'sealed box' mounting. An internal speaker box is defined by the air volume around the lower speaker in the keyboard housing. An external sound box is defined by the undersurface of the computer base and the support surface. The lower speaker is operated at a lower impedance than the upper speaker to increase the amplitude of the lower speaker sound waves relative to upper speaker sound waves. The computer base elevated by footings defines a low pass filter when on a support surface. The low pass filter attenuates sounds with a frequency of more than 5000 to 7000 Hz. The internal speaker box and external sound box (44) serve as a band pass device. The low pass portion of the band pass construction is formed by orientation the lower speaker downward into the base surface. The non-directional low frequency sound of the two speakers enhance the high frequency directional sound of the upper speaker.